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Proceedings Paper

Low order wavefront sensing and control for WFIRST coronagraph
Author(s): Fang Shi; Kunjithapatham Balasubramanian; Randall Bartos; Randall Hein; Raymond Lam; Milan Mandic; Douglas Moore; James Moore; Keith Patterson; Ilya Poberezhskiy; Joel Shields; Erkin Sidick; Hong Tang; Tuan Truong; James K. Wallace; Xu Wang; Daniel W. Wilson
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Paper Abstract

To maintain the required WFIRST Coronagraph starlight suppression performance in a realistic space environment, a low order wavefront sensing and control (LOWFS/C) subsystem is necessary. The LOWFS/C uses the rejected stellar light from coronagraph to sense and suppress the telescope pointing drift and jitter as well as the low order wavefront errors due to changes in thermal loading on the telescope and the rest of the observatory. In this paper we will present an overview of the low order wavefront sensing and control subsystem for the WFIRST Coronagraph and describe the WFIRST Coronagraph LOWFS function, its design, and modeled performance. We will present experimental results on a dedicated LOWFS/C testbed that show that the LOWFS/C subsystem not only can sense pointing errors better than 0.2 mas but has also experimentally demonstrated closed loop pointing error suppression with residuals better than 0.4 mas rms per axis for the vast majority of observatory reaction wheel speeds.

Paper Details

Date Published: 29 July 2016
PDF: 17 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990418 (29 July 2016); doi: 10.1117/12.2234226
Show Author Affiliations
Fang Shi, Jet Propulsion Lab. (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Randall Bartos, Jet Propulsion Lab. (United States)
Randall Hein, Jet Propulsion Lab. (United States)
Raymond Lam, Jet Propulsion Lab. (United States)
Milan Mandic, Jet Propulsion Lab. (United States)
Douglas Moore, Jet Propulsion Lab. (United States)
James Moore, Jet Propulsion Lab. (United States)
Keith Patterson, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Joel Shields, Jet Propulsion Lab. (United States)
Erkin Sidick, Jet Propulsion Lab. (United States)
Hong Tang, Jet Propulsion Lab. (United States)
Tuan Truong, Jet Propulsion Lab. (United States)
James K. Wallace, Jet Propulsion Lab. (United States)
Xu Wang, Jet Propulsion Lab. (United States)
Daniel W. Wilson, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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